. >>> president obama summoning congressional leaders to the white house, 3:00 this afternoon is the date for one final fiscal cliff showdown. just four days left to get this deal done or massive tax hikes and spending cuts will kick in. >>> the u.s. embassy clearing out of an african nation this morning. deteriorating security in the central african republic has forced the u.s. state department to temporarily suspend operations. there the u.s. ambassador, his diplomatic team and some private american citizens are out of the capital. the country's president has asked france and the united states for help to stop rebels that threaten rule. >>> it's not clear who will replace lisa jackson as the head of the environmental protection agency. jackson announced yesterday she's stepping down in january after the president's state of the union address. the epa created new standards for air pollution from coal power plants on her watch. >>> massachusetts congressman ed ma markey throwing his hat into the ring for kerry's senate seat. a special election would be held early this summer. markey